I think you are right Callipso !
Most girls do prefer to sleep in the nude ! I love the feeling of the soft sheets on my skin and if clothes were involved I would hate the way they twist up when I roll over ! I move around a lot at night, never waking up in the same spot. I think girls prefer to sleep nude because they want to be woken up by a surprise ! Ahhhh if only ...
I usually sleep on my stomach with my knee on a pillow snuggled up tight in the covers. Perfect for whoever was peeking at me to get right on top of me and ... well ... wake me up with a smile !
Topless girls are okay, bottomless girls are better, but totally nude girls are the best!